Death 1 because the insects eat the population.
 
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				 So killing off the population with Death-1 or worse Death-3 must have some benefit and I can not see it. If you harvest but don't sow where will you future harvest come from? Do you expand so rapidly that there is always a new green pasture?  
			
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 The insect hordes grow so fast that they cant think about future harvest. They expand or die from hunger.
Death 3 was proposed as an offensive strategy.